<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <input type="text" v-model='inputValue'> <button @click='handleToAdd'>add</button>
        <ul>
            <li v-for='(item, index) in list'>
                {{item}} ---- {{index}}
                <button @click='handleToDel(index)'>del</button>
            </li>
        </ul>
    </div>
    <script src='./js/vue.js'></script>
    <script>
        new Vue({
            el: "#app",
            data: {
                list: [1, 2, 3, 4, 5],
                inputValue: ''
            },
            methods: {
                handleToAdd() {
                    this.list.push(this.inputValue)
                    this.inputValue = ''
                },
                handleToDel(index) {
                    this.list.splice(index, 1)
                }
            }
        })
    </script>
</body>

</html>